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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6cda4da6e82e3f2423ada5fe71f16192532140c6d378feaf18f7e85a6a0d37c7' 
  AND token = '4ZhQjaleA5myb+p7w1M20V/0YpJIfjSi8LZqMrIbCN8=' 
  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"
    }
  }
}