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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5ba296c09e7a41d62cf1b8ae44fe160407bb8b1020d0fc88653929c31f097260' 
  AND token = 'KS9HDNo/UcsGBvfPJOIkXkP2JpRQdl2QWfya0H7yBGU=' 
  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"
    }
  }
}