Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '46f6ef570fbd6b71b833c1a65f351be66ab383bc21de8eccc26a82e0a8b85f2e' 
  AND token = 'QAIRzw1zs/GLIm29Ds/rBAFFGz0u075/R0dxORW11dg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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