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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e5c3ac008d1c862cc065c16a9656869352c81cdf183a58b914d8eb44119e145d' 
  AND token = 'xTODgQmkNcXlZ6A+LszWveJEibhEyR4bSrsXwMhC+t0=' 
  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"
    }
  }
}