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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e4633895bd0406035533b794e4f235cdcf55b5508c3cf60c01cfde27243c912a' 
  AND token = 'sDtxTO0sNqH0AZuFCJ9ydToKmjCBbGuV8a6ubQWSB5I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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