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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef323562023080c1594f76a4ac3f4f8b1a970fa6cbe0d4a40a6376a6a88b294c' 
  AND token = '4yWIVliAX/5mdzGVIq1ur4FX74OtY/XKLOB48wm0hsY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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