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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92f3f4b16416e59269c56e558f646c2df8b21032cec4535d8c3f292273712793' 
  AND token = 'Xczt18tAeSBkoXjN10rBd9AOwK1G9Rr4vO5czh8IxT0=' 
  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"
    }
  }
}