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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '18e86a392fbbc20d24943f8f034acaa5d8e4f356b33782c8be98b7bc795a4db4' 
  AND token = '8Mqag3r8M/MeWfol5/2gBzc1uQXrIxEQGOFe1xZNhH4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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