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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92928798072f8be62c26d747e670f81dc507ac1ba156b2ec18291396973b6aef' 
  AND token = 'zO9tcDZxFqViKm71NjdW+Sh0OQKI7pAit7WLRQZIGLY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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