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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a41fb6b28a23c2c58c184ab0826a51fae0d9bc5b963ab7f0fa6b113341f7a9dd' 
  AND token = 'aWyQCLq+H48VZCXc+2Enx8oQ5+DDIC1SFXgOkBlLuX8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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