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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a8be3235a1454b91c07798f54deec9ce8b88019b6e72e6e15cb8fe0de3e3bf5d' 
  AND token = 'XSS52xJ/5X8p8dginyGGubZyNbyx9mneHAfX5+dTP9c=' 
  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"
    }
  }
}