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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5b4c4d37a93a5ca977b2febba8fdeb10a3c57eca5403dcfe2398ec87204fda77' 
  AND token = 'zNF0fxJy5fhsAsb/4562kavNyyt+tyNxNs6W94JmuFk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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