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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4d381d02d23e8b6ad3fe17761476283a1443442089a664f8c741f3ae8e78c33d' 
  AND token = 'VzpsueAzbcU7Yp65Or2ev5b1+74mNRdxncULJMb8RIw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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