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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '05db21e5e1b0d13c26fb43d5687faed286b478dcfe42047684e6dd77fd311dde' 
  AND token = 'ehg00xGwX+/squQo2ml1TOn/t+t9ScpEr8ZuqDW6QV0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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