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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '42964290e7ff0a28ca54db121d72e63bd51d595617d1d06eaf56363a9dfc2575' 
  AND token = '7iYIoN53jA6SQ3C5hq3tM0GEx9hCdvYvzHt6k5wrtPg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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