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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd075ce40f54bc4b0db92d72a94ada3b973beb3054858cf67a02aa9115232cf29' 
  AND token = '6775mToYkt31KyhWOs64CyKNc9PUFbb/40OoOY4Pnuw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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