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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3ff6ce964b42ce0fdea06d9f23ba2c7846dfa06aa17097a4a2020b3ff2f052cb' 
  AND token = 'ntRzHa4Bi8wSPUFHGIDB69ctmnQZL3Y5MTKYhXEkyQ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00057

JSON explain

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