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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9535d6d5c805b9aee437134ef163e37f462600d55f5667c8f85d1a8eb2537b46' 
  AND token = '0u9gsw6SWIcSAW7lYy/cZPQiKTnKTwmhDXfYedBbbm0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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