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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96b73693578ea2da46e69e187f43a6f43a90dde9b2cf26c6f90a51926947182e' 
  AND token = 'wo8c0YtNiEjtffeVaym9fbIcfN9wPfYuQDLBdSwOT30=' 
  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"
    }
  }
}