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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93ba9537f116b2fe44cb96f89794de3a74374150a490c357dc58385911e6cc68' 
  AND token = 'HA9HZaE7U/xT3k8AA9zoGyvPKU3JFNo+clyVE55u7W4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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