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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df822a9adba4dc9f7c36a92c5dd6ff95658120c2de9e705314a51a3ad9744c2c' 
  AND token = '9ChRyb4t5/Qoi0ApUWP8yZBBU4tTV9AKZR9W6APGuCQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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