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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2a88819dd0edb7e921244b8f1006f1bda5070731e209896302a38e9a6a0c164f' 
  AND token = '76w1Op5yEr6NqlwNq/iS18fnd7NY6lrL5ucawjsmhfM=' 
  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"
    }
  }
}