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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb525345d38fedeb67eb1f65edfbe42fef186d9a4232a3695f79d479b58a6cde' 
  AND token = '6kmgvdijY0uHeabWvFpYmBt1EAmtg1G+xYy0pT/LUUY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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