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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bbf2be3b40485d6947fa15350150a9aa2792fd6fd1b0e807977b74b0ba2b7eb6' 
  AND token = 'Uejeiq6ni+d2dTlTTyOP4dCP+tHWAUN1EsJyPLWwn7E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00010

JSON explain

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