SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1c01572defd310783fc34ab5efe2b875e7ffb3a26b0c80dd469b37c6119cc4e' 
  AND token = 'g5F4wuWBz95BxjIpetVYN1+POGrBr3Z2dgDx/ulKxJo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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