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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5ce66b7abc18d00ea688d345df2df637c8d2e0ef1eacd9a9cc7f0dbf1248d7d4' 
  AND token = '9jrY7VmMVpGKjx1p9ItcDb2MprScF4USg0ditDt6ZlY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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