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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'deeb55d0f5f781c6b4e3a3fdeb307784d8970f2c0a2f7eb9381e17de693dbbb5' 
  AND token = 'EChx0WIZ79ylne1hM/rzjAPfNPwgjwR0V9LxHXM5C/w=' 
  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"
    }
  }
}