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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2ede804f7fa4a4da664f4ba04e842a9b21264b7547ae8f207f9678f650d30d60' 
  AND token = '0PhiT9/cbCLjDIcahVFrlsH1RcUbNvru2vym0LWc9zA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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