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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1c14cb3044d74b9ecaed036c77f2102cd52bce46f6cb555b476cc23e1301de3e' 
  AND token = 'oxZNgMb8H3Abu/XWlxmHbQ2TSL8DM0oUD9xtt5/EYzI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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