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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f523e499ebd4ec64fdb587eca82e3f63d0c5d2484caf4a87e533c2557b2f0f06' 
  AND token = 'ib/SWGVaNhkr2oKJ/n8wjfpj0oL+ec2A6q7V0Rm9Y58=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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