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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd793a2650472da30f45e616806f7180ed6d5e722fe283470a20bfdd605db430e' 
  AND token = 'Fm8zgNMxJ27HuOC+vvRn+3vUNP0GzYu7015I3S2YTaA=' 
  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"
    }
  }
}