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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5c1d54fc94de9c62359a98539282280e52980f1ac8d6b0838d572c7013dfecd1' 
  AND token = 'xObViDpgtafiDDz4VzLH4xoQO9eTE7Noi9h7qsOG5K8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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