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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8269b3a8c5e619d876d34b43ff3ed8984629688f346ec993ab70e51734287576' 
  AND token = 'dKg5np0mHlffF7k73k8FeroUSBdIreS4eEdceBTf2KE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00010

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}