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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f84474fd4407136af6e806c1b8780a0110ec559f6616859c57c9d8eabcd92c5a' 
  AND token = 'RY7a/SOn5geZQTiZbo7zMg+uIgr0okh0QTMbgOnuvec=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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