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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bccd1c3694bfe116793668dc8abce4e76890ed0bccff7c6fe8fed3e98addbb58' 
  AND token = '9My7d4D1F3Peh4oVAiEpyQoye+ZFVfEk/acbhNYMaYs=' 
  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"
    }
  }
}