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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '18cab7763b70dd6bcf3f08c87c31b5ba1f82c58c81763299eb23f816174461ce' 
  AND token = 'c3b1Mj9Z+irlNTnJc5qATYYWHP+VQPZ/xZhTbXZbqP0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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