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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '03c2a7a5669943b07d3f37c048f6de31de6f041063485fc192f61e551a8f887f' 
  AND token = 'ZlpiV/2nJLDTSfo8eU+2SnkLM4+TRZj+h9Vtn7DE5Sk=' 
  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"
    }
  }
}