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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dea2711aebce6b823900a2ac423964ff508620352fd004ad2480c00d013bc81c' 
  AND token = '4ZsU2DJ3QU9g2zwnCKf54WNrcSZRIowKQS0eyAAyvd0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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