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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c0ee303cace77951aef3bf77d8923db31c99bd9d2bc3b44da8ecb9a095e126fc' 
  AND token = '5DnGW4gTLYrk+kz0WFcvZMqMXwWWFtS3xb+3jtEyml4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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