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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '820af15dc3ac17621f231c231bb267a0caf9a1ce84a54f1aa54547c0d846d2c7' 
  AND token = 'u72+xufRwBTRGmc59ppnoMOEIHJqJL0vGgwPgNoXOUk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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