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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d65dee02cabb94d70db575ea3a30160807939aa9442fc9cca2074de16ab737e' 
  AND token = '6e3Cve/hjjK9o5z2SMZM/GgD6eFBFofS+UH2JsIY0A8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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