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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '752cd2f22a52e146181f5b65bae6d3395c4a368df8eea4304b7a400ce79d4b0f' 
  AND token = 'bKEzqXvzF2Hqv2RSRM9UtmpTos32T+YdwYv5Asr8b6s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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