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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dfffbdf5c225f1554d7d8744997957b081ab25f481f0bbb116f1b9c2cd66164d' 
  AND token = 'caL8yV4007t+aOU1mODkjF1N8Qha8+z/UgYKa3mC8cE=' 
  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"
    }
  }
}