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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '19a85b7a929f6dc5e7e8a94985e21378bc7685c4f4ed956e02bb2ebc2cf02e5a' 
  AND token = 'n5eh5UouYhrg2U7CYWosIQxzBAT0E5+jbUb1pLzU0Zg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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