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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '81c262692bf75d008fbee2b537eb29faa509b5fe089a976dc7ddd8870762396b' 
  AND token = 'bP8h+0UutOpHdpX/CnYJOS/IflmmWMR11ha0rjYcr7E=' 
  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"
    }
  }
}