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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '77b999bd4691a03b89691434bece2d801de49c5ead3c2e6b2cdc6e829f1198de' 
  AND token = 'vilJp5TMUz3/oTQplEuxUjVQYx7CPKPbVtl6lNXCvBU=' 
  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"
    }
  }
}