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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca665edea5540cca780cfd79b38be0dc905ac01d4739b941c80ba3218376e3a3' 
  AND token = '5S38DbRI/Y8Tb/S/1TJ38+iSUijTKzQcEaakOvfW0z0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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