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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd274e66b56d4df09ff820cbe4976aac1d31f3e09baee3f5a3495453b242a0bed' 
  AND token = 'tL50+9c6299ZkGjvf7NjmluAd1Z5N32iU9vj0FiNPr0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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