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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '85a6e25495ba969a31f8366166e21e0e1d47af59ac1736bc51a0ec498bfed0c3' 
  AND token = 'MwR+EH+pOjrDOC6L5yxqYI7SguSyp5wy3NwdBVk08gA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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