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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'baf271763e538b323ed663fb9f78b7f0d73579e1e0f375a3515d712011fe066d' 
  AND token = 'wcBkNXmw9G+DF3r74AynVtk2PUCxhq1sS5sln9FN+68=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00011

JSON explain

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