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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fdf5275fc5014d2f42cf7f1b71f13b816c1992e35897de507751cddeb9847baf' 
  AND token = '0rxxI1Fe/Xd8A9XxJ/OfmB77Fgu0HRwxtLMRJmjrudk=' 
  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"
    }
  }
}