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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '12d352d58f7be94b3df7bf7104a9e5be70959abe9b217962531b96f1822e7a13' 
  AND token = 'caIvBRdR8k4lmt+rHgQEmV+eh1ifRARV3SCC4nQrp9k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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