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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9362e48c0d55c5e97bfb2bc85440ddedccdd611b2b02d9d2f1f74e2e5cf0f941' 
  AND token = 'Sfx2j6R7XxwhziBf7Zeubrd1pV6uxS0ED4V2WGtwS1M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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