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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'beacc9d71b4e3be8a0c36102f4c0d9019328fc4ff6269e07ced48649d689cfbb' 
  AND token = 'lZQbQhvJ/OyNMK2IQ6cpbpzVcZsk7CS7O2pJx4t7yig=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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