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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9300eadb5f0c8f2a9dcacbda8c9e02ec0568d1aa73792480ce503a7cdc388895' 
  AND token = 'hQxm7Lp0xM5g8GjGWAKeHejvlvV3Uo24rsglznZbxl8=' 
  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"
    }
  }
}