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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '62a6115079fcb4f81a149a64a3ad0959db155f138ac03eb9b99a83af971995d7' 
  AND token = 'mREWzDCw4rUzYVelKp1f6cz9r9TXryquz684eNgAuCU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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