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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '28a8da6b25edf338bfe341a518acf561d78c6169de2b38397af60d4372d40837' 
  AND token = '7W4R3pvfBUdxCM2EICCRS4yImXeW9fX3/uGnsJN90QU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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