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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9230fc79d4d07bccc9349e83b855c73e55f3d298d63227f3f04230df0542e194' 
  AND token = 'HAZ6vMQWfI59cf3xhRTWAJcwaU3mEN/jnEDD3d3lgUc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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