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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b97a045ea247ee256bc25c8b3b03305e7d61bd0786f2bc18573cd9f7303074f' 
  AND token = 'ZXHFMNARcAtEw3hoi3kd3bZ7p7zZ9a548WGKBIy+rWI=' 
  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"
    }
  }
}