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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aedeb865c5740a8d21840893461b1cbe6db4f0fdf5b9a165d9ecf2f080c10309' 
  AND token = 'tD0Di4qHFZ8ZBaujW72/mqDSB/e1CuKCsUG4GSgMNyM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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