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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f489897807d9f280920762e79105343d4f0f88eb2407b59af0241d94de99951f' 
  AND token = 'SW1WVzkx9kymtTzffgHBBLI5D/A5aHrZ+0KSlRosdLA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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